Microstructural observation of brazed Ti-15-3 alloy using the clad Ti-20Zr-20Cu-20Ni foil
Journal
ISIJ International
Journal Volume
53
Journal Issue
4
Pages
726-728
Date Issued
2013
Author(s)
Abstract
Microstructural observation of Ti 20Zr 20Cu 20Ni brazed Ti-15-3 alloy was performed. All joined surfaces were ground by SiC papers up to grit 1000 and then ultrasonically cleaned by acetone prior to brazing. Clad Ti 20Zr 20Cu 20Ni foil with the thickness of 50 μm was chosen as the braze alloy. Traditional vacuum brazing was performed under the vacuum of 5×10 5 mbar. The heating rate was set at 0.5°C/s throughout the experiment. Cross-sections of joints after brazing were cut by a low-speed diamond saw and subsequently examined by electron probe microanalyzer. For the specimen furnace brazed at 870°C for 1800 s, the joint is dominated by blocky Ti2Cu, Ti2Ni and β -Ti in (Ti,Zr)2Ni matrix. Depletion of Cu, Ni and Zr from the braze melt into Ti-15-3 substrate during brazing results in forming grain boundary (Ti,Zr)2Ni and Ti2Cu precipitates in β -Ti substrate. The amounts of intermetallic phases in the brazed joint are greatly decreased with increasing the brazing temperature.
Type
journal article